GB/T 44415-2024 PDF English
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| GB/T 44415-2024 | English | 275 |
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Requirements and methods for road test of motor vehicles braking performance based on GNSS
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GB/T 44415-2024: Requirements and methods for road test of motor vehicles braking performance based on GNSS
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT44415-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.180
CCS R 86
Requirements and methods for road test of motor vehicles
braking performance based on GNSS
ISSUED ON: AUGUST 23, 2024
IMPLEMENTED ON: MARCH 01, 2025
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Abbreviated terms ... 6
5 Inspection requirements ... 7
6 Inspection methods ... 8
7 Data processing ... 10
8 Inspection records ... 14
Appendix A (Informative) Inspection records ... 15
Bibliography ... 16
Requirements and methods for road test of motor vehicles
braking performance based on GNSS
1 Scope
This document specifies the requirements, test methods, data processing and test
records for road test of motor vehicle braking performance based on GNSS.
This document applies to road test inspection of motor vehicle braking performance.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB 7258-2017, Technical specifications for safety of power-driven vehicles
operating on roads
GB/T 39267-2020, Terminology for BeiDou navigation satellite system (BDS)
GB/T 39399-2020, General specification for BeiDou navigation satellite system
geodetic receiver
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as those
given in GB 7258-2017, GB/T 39267-2020, and GB/T 39399-2020, apply.
3.1
real-time kinematic; RTK
A type of GNSS relative positioning technology that mainly achieves high-precision
dynamic relative positioning through real-time data links between base stations and
mobile stations and carrier relative positioning fast solution technology.
[Source: GB/T 39267-2020, 2.3.38]
3.2
GNSS: Global Navigation Satellite Systems
MFDD: Mean Fully Developed Deceleration
PPS: Pulse per Second
UTC: Coordinated Universal Time
5 Inspection requirements
5.1 Environmental conditions
5.1.1 Ambient temperature: 0 ℃ ~ 40 ℃.
5.1.2 The wind speed shall not exceed 3 m/s.
5.1.3 The relative humidity shall not exceed 95%.
5.1.4 When there are special requirements for environmental conditions, the
corresponding test methods shall be followed.
5.2 Test road
5.2.1 The test road shall be a flat, clean, dry, and homogeneous concrete or asphalt
pavement with good adhesion properties.
5.2.2 The longitudinal slope of the effective test section of the test road shall not be
greater than 1.0% within any 50 m length, and the transverse slope shall not be greater
than 2.0%.
5.2.3 The test road shall be located in an open area with no strong electromagnetic
interference nearby.
5.2.4 When there are special requirements for the test road, the corresponding test
method regulations shall be implemented.
5.3 Inspection parameters
The motor vehicle braking performance road test process shall include the following
parameters:
a) time (ti), in seconds (s);
b) vehicle speed (vi), in kilometers per hour (km/h);
c) brake pedal actuation time (ta0), in seconds (s);
d) vehicle position (xi, yi, zi), in meters (m);
6.1.1 The tires on the same axle shall be of the same model and specification, with
basically the same tread depth and normal tire pressure; the tire bolts and half-axle bolts
shall be complete and tightened; the tread and sidewall of the tire shall not have cracks
and cuts longer than 25 mm or deep enough to expose the tire cord layer, as well as
other defects, abnormal wear and deformation that affect use.
6.1.2 For vehicles using pneumatic brakes, the air reservoir pressure shall comply with
the relevant requirements of 7.8.1 of GB 7258-2017.
6.1.3 For vehicles using a vacuum power servo system, ensure that there is sufficient
vacuum when starting to brake.
6.1.4 The steering wheel of the vehicle under test shall be flexible, easy to operate, and
free of sticking. When the vehicle under test is driving normally, the gear shifting shall
be normal, and there shall be no wheel sticking or locking. When the vehicle under test
is braking, the brake pedal shall operate normally and respond quickly.
6.1.5 Install the pedal trigger switch or pedal force meter on the brake pedal of the
vehicle under test. If the brake pedal is too hard, a pedal force meter shall be used.
6.1.6 For test items with special requirements for vehicles, the corresponding test
methods shall be implemented.
6.2 Preparation of instruments and equipment
6.2.1 For local base stations, the base station GNSS antenna shall be installed in a
relatively open environment, relatively high terrain, with no signal reflectors (large
water areas, large buildings, etc.) around, and stable ground, away from electromagnetic
interference such as TV transmission towers and mobile phone signal transmission
antennas.
6.2.2 For the local reference station, it shall be turned on and preheated before the test
begins to ensure that the reference station obtains its own accurate position information.
6.2.3 The main antenna of the RTK receiver shall be placed in the center of the vehicle.
6.2.4 The main antenna and directional antenna of the RTK receiver shall be in an open
and unobstructed position, and there shall be no relative displacement between them
and the vehicle body during the entire test process.
6.2.5 Install the pedal switch or pedal force meter on the brake pedal.
6.2.6 Check that the instrument is turned on and warmed up to ensure that the RTK is
in a fixed solution state.
6.3 Inspection procedures
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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